#!/usr/bin/node

const argv = process.argv,
      log = console.log;

//vallidate
//1 argv number equal 3
if(argv.length !== 3){
  log('cmd exit-code');
  process.exit(2);
}
//code type is number
if(isNaN(Number(argv[2]))){
  log('argv must be number');
}
//code range > 0
if(Number(argv[2] < 0)){
  log('argv must >= 0');
  process.exit(3);
}
process.exit(argv[2]);
